Iron and metal working machinery

ABSTRACT

A main beam is pivoted between the ends and operates punch on the downward stroke of the shorter end and a plurality of detachable metal working tools on the down stroke of the longer end. A secondary beam operates a shear also on the down stroke of the longer end. Two piston and cylinder assemblies are connected to the beam and valving permits the larger of the cylinders to be used for most operations with the smaller cylinder returning the beam to the starting position rapidly. If more force is required both cylinders can be used together for the power stroke.

I United States Patent [151 3,701,276

Malmgren 1 Oct. 31, 1972 [54] IRON AND METAL WORKING 172,599 l/l876Beesley ..83/5l8 MACHINERY 606,194 6/1898 Denham ..83/5l5 [72] Inventor:John Stanley Malmgren, Winnipeg 855,765 6/1907 Gerlach ..83/518 M 't amoba Canada Primary ExaminerCharles W. Lanham Asslgnee! -9 p g AssistantExaminerGene P. Crosby Mamtoba, Canada Attorney--Kent & Ade

[22] Filed: July 15, 1970 [57] ABSTRACT [21] Appl. No.: 55,053

A mam beam is pivoted between the ends and operates punch on thedownward stroke of the shorter [52] US. Cl. ..72/404, 72/324,72/453, andand a plurality of detachable meta] working tools [51] I t Cl 83/5 onthe clown stroke of the longer end A secondary I! beam operates a Shearalso on the down stroke of the [58] F'eld Search"83/518 598; 72/450longer end. Two piston and cylinder assemblies are 72/453 404 connectedto the beam and valving permits the larger of the cylinders to be usedfor most operations with 6] References cued the smaller cylinderreturning the beam to the starting UNITED STATES PATENTS positionrapidly. If more force is required both cylinders can be used togetherfor the power stroke. 3,468,206 9/1969 Bakula 83/599 3,472,057 1969Persico ..72/450 28 Claims, Drawing Figures .a L 33;;2 31 e7 sea 44 g Ft w 75 1 L-J rl F T{--f I54 l4 11 ea 1.; I53

5 ea eQQLW; J 79 "-rr- 64r r":*'. r 29 PATENTEU our 3 1 1912 SHEET 1--0F 5 FlG 2 JOHN s. MA'ILMGREN ATTORNEY PATENTED 0m 3 1 I912 SHEEI 2 0F 5azl FIG INVENTOR JOHN S MALMGREN ATTORNEY FIG.

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PNENTED nm 3 1 m2 SHEET '4 BF 5 FIG FIG l4 FIG l7 FIG l6 iNVENTOR JOHNS. MALMGREN m QQQ ATTORNEY P'A'TE'N'TEDnm 31 m2 3' 7O 1' 276 sum 50F 572W 45 0 0 a a o O) 0 1 0 O 5| "a 0Z O FIG .l8

("9 :06 I06 3 oPERAnoN IN our E) l SHEAR 5 3 2 MAX.3HEAR 2 PUNCH 3 5 2INVENTOR MAX- 3 I JOHN SMALMGREN FIG. 19 ATTORNEY IRON AND METAL WORKINGMACHINERY This invention relates to new and useful improvements in metalworking machines commonly known as iron workers".

Such machines usually incorporate mechanically operated crank and togglesystems which in turn operate accessories such as shear devices, brakingdevices, notchers, copers, rod shearing devices and punch presses.

Iron working machines normally available suffer from many disadvantages,the principal one of which being poor mechanical advantage and lack ofrigidity in the operating parts.

These conventional machines which utilize a crank arm principal caneasily be overloaded during use with subsequent damage occurring tolinkage and bearing. The present device eliminates the crank and the useof hydraulics prevents overloading from occurring.

Furthermore such machines are not flexible in that they do not providefor a great variety of attachments to be used therewith.

The principal object and essence of the invention is to provide an ironor metal working machine which can first be placed in what I define as ashear or accessory mode or, laternatively, can be placed in a punchpress mode. When in the punch press mode, the mechanical advantage issuch that punch press operating pressures can be extremely high.

Another advantage of the present device is the fact that a secondarybeam is incorporated therewith which includes a shear secured thereto.

Another object of the invention is to provide a device of the characterherewithin described in which various accessories can be operated by thedevice in the accessory or shear mode, any one of which can readily beplaced in position or removed from the machine without extensive boltingor unbolting being required.

One of the principal objects of the present invention is the fact that apair of hydraulic piston and cylinder assemblies are utilized one ofwhich is of a greater volumetric capacity than the other. The relativelylarge piston and cylinder assembly is normally used for punch pressoperations or shear and accessory operations while the smaller cylinderis used for return stroke operations, it being understood that with aconstant displacement pump, the smaller piston and cylinder assemblymakes the return stroke faster than the power stroke.

However, if additional power is required, simple valving can be actuatedso both piston and cylinder assemblies can be used on the power strokeeither for the punch press mode or the accessory and shear mode with thesmaller piston and cylinder assembly still being used for the fasterreturn stroke.

A yet further object of the invention is to provide a device of thecharacter herewithin described which includes a novel hold-down devicefor the material being used with the shear component.

Finally a still further object of the invention is to provide arelatively compact heavy duty iron or metal working machine which isextremely versatile in operation, is provided with flexibility inasmuchas power requirements are concerned and which is otherwise well suitedfor the purpose for which it is designed.

With the foregoing in view, and such other or further purposes,advantages or novel features as may become apparent from considerationof this disclosure and specification, the present invention consists of,and is hereby claimed to reside in, the inventive concept 1 which iscomprised, embodied, embraced, or included in the method, process,construction, composition, arrangements or combination of parts, or newuse of any of the foregoing, of which concept, one or more specificembodiments of same are herein exemplified as illustrative only of suchconcept, reference being had to the accompanying figures inwhich:

FIG. 1 is a front elevation of the machine broken away in part forclarity.

FIG. 2 is an end elevation of FIG. 1 taken from the left hand sidethereof.

FIG. 3 is an end elevation of FIG. 1 taken from the right hand sidethereof.

. FIG. 4 is a sectional view substantially along the line 4-4 of FIG. 1.

FIG. 5 is a plan of the pedal assembly per se.

FIG. 6 is a partial end view of the pedal assembly.

FIG. 7 is an isometric view of the pedal assembly selector component perse.

FIG. 8 is an enlarged fragmentary front elevation of the pedal assemblyselector fork.

FIG. 9 is an end view of FIG. 8.

FIG. 10 is a fragmentary end view of the shear mode pedal and main valveassembly.

FIG. 11 is a schematic view of the hydraulic layout.

FIG. 12 is a fragmentary isometric view of the punch press end of themain beam.

FIG. 13 is an isometric view of the punch mechanism per se.

FIG. 14 is an enlarged side view of the attaching linkage of the punchmechanism.

FIG. 15 is a fragmentary side view of the shear press hold-downmechanism.

FIG. 16 is an enlarged end view of the hold-down bar per se.

FIG. 17 is a front elevation of the hold-down bar per FIG. 18 is anisometric view of the machine.

FIG. 19 is an enlarged view of the plate giving the selector valvepositions.

FIG. 20 shows an alternative embodiment of the pedal assembly.

In the drawings like characters of reference indicate correspondingparts in the different figures.

Proceeding therefore to describe the invention in detail, referencecharacter 20 indicates generally supporting framework consisting of alower substantially cubical frame 21 composed of angle irons includinglongitudinal members 22, transverse members 23 and vertical members 24.

Situated within this base framework is a source of power taking the formof an electric motor 25 driving a' constant displacement pump 26 whichis connected to a fluid reservoir 27 as will hereinafter be described.

Further supporting structure 28 extends upwardly from the basesupporting structure 20 and takes the form of two relatively heavy dutyspaced and parallel plates 29 surmounted by a transverse plate 30.

At one end of these plates they extend upwardly to form main beamsupport plate portions 31 as shown in FIGS. 1, 4 and 18.

A trunion support pad 32 is welded to the inside of the main beamsupport plates 31 to support a trunion bearing 33 upon which the mainbeam 34 is mounted for reciprocal movement in a vertical plane. Thismain beam is relatively heavy and is journalled upon the trunion 33between the ends thereof but towards one end 35 which is defined as thepunch press end or the relatively short end of the main beam.

The other end 36 of the main beam is defined as the relatively longportion thereof or the accessory operating or shear operating portionand these two portions are of course defined by the position of thetrunion 33.

A pair of hydraulic piston and cylinder assemblies 37 and 38 aresupported within the lower base framework 20. One piston and cylinderassembly 37 is supported by a transverse trunion mounting 39 between thetwo plates 29 and the other piston and cylinder assembly 38 is alsosupported by means of a trunion bearing assembly 40 between the plates29 but inboard of the first piston and cylinder assembly 37.

Also of note is the fact that the volumetric capacity of the piston andcylinder assembly 37 is greater than the volumetric capacity of thepiston and cylinder assembly 38, the reasons for which will hereinafterbecome apparent.

The piston rod 41 of the piston and cylinder assembly 37 extendsupwardly and is connected by means of pivot pin 42 to the lower ends ofa pair of link plates 43 maintained in spaced and parallel relationshipby means of web 44. e

The upper ends 45 of these link plates are connected by means of a pivotpin 46 to adjacent the end 47 of the relatively long portion 36 of themain beam as clearly shown in FIGS. 1, and 3;

Pivot pin 42 also extends through one end 48 of a secondary beam 49which is pivoted or journalled between plates 31 by means of trunion 50and the purpose of this secondary beam will be explained later.

The piston rod 51 of the other piston and cylinder assembly 38 isconnected by means of pivot pin 52 to the secondary beam 49'but inboardof the end 48 as clearly shown in FIG. 1.

The plates 31 are apertured as at 53 to form a shear accessory inassociation with the secondary beam 49. A shear bed 54 extends throughthe apertured plates 31 and a shear block 55 is mounted upon the bed.

A shearing blade 56 is bolted within a recess 57 formed upon theunderside of the secondary beam towards the trunion 50 and verticalreciprocation of the secondary beam as will hereinafter be described,will operate the shearing blade 56 in the conventional manner.

At this time reference should be made to FIGS. 15, 16 and 17 which showthe novel hold-down assembly for the shearing component.

A work support table 57' is bolted to one of the plates 31 and extendsoutwardly at right angles therefrom adjacent the shear block 55.

A pair of hold-down bar support brackets 58 exten outwardly one uponeach end of the opening 53 and a pair of relatively short brackets 59also extend outwardly but spaced above the lower brackets 58.

The hold-down bar is hexagonal and is indicated by reference character60 in FIGS. 16 and 17 and upon each face of the hexagonal bar is weldedlongitudinal strips 61 of steel of varying thicknesses. These stripsterminate short of the ends 62 of the bar so that these ends can berested upon the lower supports 58 and then moved inwardly under thesupports 59. By rotating the bar prior to engaging same under thesupports 59, the relevant strip 61 can be moved to the lowermostposition so that it engages the work piece 63 (see FIG. 15) andholdssame firmly upon the bed 57 during the shearing operation. The operationof the-hold-down bar is simple, quick and efficient.

The transverse plate 30acts as a bed for various accessories such asthose shown in phantom in FIG. 1 and identified by reference characters'64 which indicates an angle shear accessory or 65 which indicates abrake accessory. Many other accessories can be rested upon this bed foroperation by the main beam, such accessories including rod shearingdevices, notches, copers, and various forms of brakes and the like. Allof these are operated by the engagement of the under side 66 of the mainbeam upon the upper sides of the accessories thus moving same downwardlyto actuate same.

For example, the accessories include the upper member 67 which isengageable by the underside 66 of the main beam. This upper membercarries the brake or shear 68 or 68' respectively which moves samedownwardly to the work surface 69 or 69 respectively. Rods 70 movedownwardly within bearings 71 to guide the work component downwardly andsprings (not illustrated) return them to the uppermost position-afterthe operation is complete. However, the construction of theseaccessories does not form part of the present invention.

The other end 35 of the main beam 34 operates a punch press assemblycollectively designated 72.

The plates 31 are cutaway as at 73 on the far side thereof to form thefloat for the punch press and a bed 74 spans the lower edges of thiscutaway portion as clearly shown.

Reference should be made to FIGS. 12, 13 and 14 relative to the assemblyof the punch press portion.

Situated between the portions 75 of the plates 31 is a cylindricalbearing component 76 secured in position by means of bolts 77 extendsthrough the plates and into the cylindrical bearing 76. A mandrel 78 isbearabl') supported for reciprocation within the bearing cylinder 76 anda screw threaded lower end 79 receives the punch'press tools in theusual way.

The upper end 80 of the mandrel is engaged by the lower rounded surface81 of the punch press end 35 of the main beam 34 as same is moveddownwardly around trunion 33.

Due to the fact that the trunion is relatively close to this rou'ndedend 81, the mechanical advantage given by the main beam is considerable.

Means are provided to detachably secure the mandrel to the main beampunch press end 35 and take the form of a pair of link plates 82 pivotedto the upper end of the mandrel 78 by means of pivot pin 83. A detent 84is formed upon the link plates 82 and these normally engage overspindles 83' extending from each side of the end 35 of the main beamunder which circumstances the rounded portion 81 is in contact with theupper end 80 of the mandrel through the slide block To detach themandrel from the main beam, a handle 85 is secured between the two linkplates 82 so that they can be moved around pivot pin 83 to disengagethem from the spndles 83'. Coil springs 86 normally maintain the linkplates in the upright position as shown so that when the end 35 of themain beam moves downwardly, the spindles strike the cammed surfaces 87on the link plates, move outwardly against pressure of springs 86 andthen snaps them into position as soon as the detents 84 can engage overthe spindles 83'. This means that the mandrel is automatically raisedfrom the work when the end 35 of the main beam is raised after thepunching operation.

It will be appreciated that when the accessory end or the shearcomponent is being operated, the relatively long end 36 of the main beamshould normally be in the uppermost position, should move downwardlyupon the power stroke and then should return to the uppermost position.

However when the punch press is being operated, the reverse situationoccurs. In the punch press operation the relatively short end 35 isnormally in the uppermost position which means that the end 36 will bein the lowermost position. During the punching operation or powerstroke, the end 35 moves downwardly and then returns to the uppermostposition at the end of the stroke.

I therefore provide means for routing the hydraulic fluid to therequired sides of the pistons of the piston and cylinder assemblies 37and 38 as desired.

A pedal assembly collectively designated 88 is shown in FIG. 5. Itconsists of a shaft 89 mounted within the base supporting framework 20and being journalled within bearings 90 situated either end thereof andsecured to the supporting structure.

An accessory or shear operating pedal 91 is secured to the end of a bar92 which in turn is secured to shaft 89 and extends therefrom. Thispedal extends beyond the base of the machine as clearly shown in FIGS.1, and 18.

A main shuttle valve 93 (see FIGS. 10 and 11) is secured within theframework and is provided with an inlet port 94 connected to pump 26, areturn port 95 connected to the reservoir 97, and upper port 96 and alower port 97.

This valve is conventional in construction and is operated by means of ashuttle valve element 98 extending from the lower side thereof. When inthe midway position, the shuttle valve is in neutral so that fluid ispumped from pump 26 straight through theshuttle to the discharge 95 andback to the reservoir.

When in the lowermost position, fluid is routed from the inlet 94 to theoutlet 96 and when in the uppermost position, fluid is routed from theinlet 94 to the lower outlet 97'.

This shuttle valve is operated by a link 99 (see FIG. 10) pivoted by oneend thereof to intermediate the ends of the pedal bar 92 and by theother end thereof to one end of a transverse link 100 by means of pivotpin 101. The other end of link 100 is pivoted by means of pin 102, to abracket 103 secured to the supporting structure and the lower end of theshuttle element 98 is pivotally connected intermediate the ends of link100 all ofwhich is clearly shown in FIG. l0.

Therefore when the pedal 91' is depressed by the operator, the shuttleelement 98 is moved to the lowermost position and the fluid is routedfrom 94 through the upper outlet 96.

Reference to the hydraulic schematic diagram shown in FIG. 11 indicatesan upper manifold 104 and a lower manifold 105 and four manuallyoperated selector valves designated 1, 2, 3 and 4.

Each of these selector valves is a conventional form of shuttle valvemanually operated by means of plungers 106 situated on one end thereof.

Various conduits are shown and these are prefixed by the letter C forclarity.

Conduit-C10 extends from the upper outlet 96 of the main shuttle valve93 to the inlet 107 of the upper manifold 104. Conduit C11 extends fromthe lower outlet 97' of the main shuttle valve to the inlet 108 of thelower manifold 105.

Outlet 109 of the upper manifold is connected by conduit C12 to one side110 of actuator valve 3 and outlet 111 from the upper manifold 104 isconnected by conduit C13 to one connection 112 of actuator valve no. 1.

Outlet 1 13 of the lower manifold 105 is connected by conduit C14 to thesecond outlet 114 of actuator valve no. 4 and the other outlet 115 ofthe lower manifold is connected via conduit C15 to the other connection1 16 of actuator valve no. 2.

Connection 117-1,2, -3, and -4 show venting connections to the fouractuator valves which vent back to the reservoir 97 as indicated byconduit C16 and it should be observed that connecting conduits C12 andC13 attached to the same side of valve 1 and 3 and vents 117-1 and 117-3also connected to the same side of these valves whereas theseconnections are reversed in valves 2 and 4.

It should also be appreciated from reference to FIGS. 18 and 19 that theactuators 106 of valves 3 and 4 are connected together so that they areboth either in or out at the same time.

Each of the actuator valves 1, 2, 3 and 4 is provided with an outlet orfurther connection 118-1, 118-2, 118-3 and 118-4. A conduit C17 extendsfrom 118-1 to upper end of the cylinder of the piston and cylinderassembly 38. A conduit C18 connects 118-2 to the lower end of thecylinder of this piston and cylinder assembly 38.

A conduit C19 connects 118-3 to the upper end of the cylinder of thepiston andcylinder assembly 37 and a conduit C20 connects 118-4 to thelower end of the cylinder of the piston and cylinder assembly 37.

The actuators 106 extend through a mood selector panel 119 situated onthe front of the machine and illustrated in detail in FIG. 19. When itis desired to use the machine in the shear or accessory mode, and usingnormal power, the actuators 106 of the valves 1 and 2 are pushedinwardly and the actuator 106 of valve 3 is pulled out and this ofcourse pulls out the actuator of the valve 4 as hereinbefore described.Under these conditions, when the pedal 91 is depressed by the operator,fluid is routed from the pump 26 through the main shuttle valve 93 tothe upper outlet 96 and the direction of the fluid in this particularphase of the operation is indicated by arrows 120 in FIG. 11.

Fluid then passes through conduit C10 to the upper manifold 104 and fromthere it passes through conduits C12 to actuator valve no. 3. Theposition of the shuttle of this valve routes the fluid through conduitC19 to above the piston within the piston and cylinder assembly 37 andthis supplies the main power stroke or downward movement of the portion36 of the main beam thus operating the accessories or the shearcomponent.

As this piston moves downwardly, fluid is exhausted from the undersidethereof to conduit C20, to valve 4 and from then through 117-4 back tothe reservoir.

The downward movement of the portion 36 of the main beam also moves thepiston downwardly of the piston and cylinder assembly 38 but due to thefact that the actuator 106 of valve no. 1 is moved inwardly under thesecircumstances, air is drawn in from conduit C16 (which enters thereservoir above the fluid level) and passes through conduit C17 to abovethe piston so that fluid is not utilized under these circumstances.

Means are provided which will hereinafter be described, to reverse themovement of the shuttle component 98 when the portion 34 of the beamreaches the lowermost position. This causes fluid to flow from conduit94, through the lower outlet 97 of the main shuttle valve to the lowermanifold 105. It then travels through conduit C to the actuator valveno. 2 and from there via conduit C18 to the underside of the piston inthe piston and cylinder assembly.38. Due to the fact that the volumetriccapacity of this piston and cylinder assembly is smaller than that ofthe piston and cylinder assembly 37 and due to the fact that pump 26 isa constant displacement type, thepiston moves upwardly more rapidly thanthe piston moves downwardly on the power stroke thus giving a fastreturn stroke. Fluid, of course, is expelled from the upper end of thecylinder of the piston and cylinder assembly 37, back through conduitC19 to valve no. 3 and thence back through conduit C12 to the uppermanifold to the reservoir.

If, however, maximum power is required then piston and cylinder assembly38 can be coupled with piston and cylinder assembly 37 to give a doublepower actuation to the power stroke. Under these circumstances theactuator 106 of the valve 2 is left in the innermost position and theactuator of valve 1 is moved outwardly. This reverses the action so thatfluid flows through C17 to the upper end of the cylinder 38 thus addingits power to piston and cylinder assembly 37.

In order to operate the punch press portion of the device it will beappreciated that the fluid flow has to be reversed which means that thepedal 91 is normally in the lowermost position thus ensuring thatportion 36 of the main beam is at the lowermost position and portion 35is in the uppermost. Furthermore a further pedal has to be providedadjacent the punch press end in order to operate same.

This pedal is identified by reference character 121 and is situated uponthe end of a bar 122 which in turn is fixed to a cross shaft 123 mountedwithin support bearing 124 in a manner similar to the support of shaft89 hereinbefore described.

This shaft 123 is situated at right angles to shaft 89 and the twoshafts are interconnected by bevel pinion segments 125 as shown in FIG.5. The segment 125 off standing from shaft 123 engages the segment 125secured to the end of shaft 89 so that partial rotation of shaft 123will also cause partial rotation of shaft 89. The bar 122 is secured toshaft 123 as here and before described and with pedal 91 in thelowermost position, it will be appreciated that pedal 121 is in theuppermost position so that depression of this pedal 121 will actuate theshuttle valvecomponent 98 in a manner opposite to that hereinbeforedescribed. It is not believed necessary to describe the routing of thehydraulics under these circumstances as it is believed that they can befollowed from FIG. 11.

Suffice to say that when pedal 121 is depressed, fluid is fed to theunderside of the piston of the piston and cylinder assembly 37 thusmoving the piston upwardly and raising the portion 36 of the main beamupwardly which, of course, lowers the portion 35 to operate the punchpress.

When the pedal is released, the shuttle valve reverses and fluid is fedto the upperside of the piston of the piston and cylinder assembly 38thus moving same downwardly and acting as the return stroke for the mainbeam 34.

Under normal punch press operations, the actuator of valve no. 3 is inthe innermost position and the actuators of valves 1 and 2 are in theoutermost position.

However if maximum power is required, then the actuator of valve 2 ismoved inwardly and this causes fluid to flow to the underside of thepiston of the piston and cylinder assembly 38 thus giving additionalpower to the power stroke of the punch press.

Means are provided to switch the machine from the accessory or shearmode to the punch press mode and vice versa and details of this areshown in FIGS. 6 to 9 inclusive.

A lever 126 with an actuating handle 127 upon one end thereof, issecured to shaft 128 which in turn is supported within a bearing 129secured to a vertical member 130 of the framework, it being understoodthat lever 126 is external of the machine as clearly shown in FIG. 18.

This lever is movable between anupper position indicate by the letter Sand the lower position indicated by the letter F. It should beunderstood that the letter S represents the shear or accessory mode andthe letter P indicates the punch press mode of the machine.

This lever is adapted to operate a rocker assembly collectivelydesignated 129. This rocker assembly includes an elongated plate 130welded intermediate the ends thereof to shaft 123 and at right anglesthereto. An elongated closed ended slot 131 is formed within the plateand each end of this slot is provided with an enlarged portion 132 asshown in FIG. 8.

An overcenter slide component 133 consists of a pair of plates 134 oneupon each side of the slotted plate 130 with a pin 135 joining the twoplates together and passing freely through the slot 131 within which itis slidable lengthwise. When at one end or the other, this pin engagesthe enlarged ends 132 of the slot 131.

A further pin 136 joins the upper ends of these plates 134 together andholds the lower end of the tension spring 137 which extends upwardly tobe secured to an adjusting bolt 138 (see FIG. 6) engaging a frame member139. The spring anchor or adjusting bolt 138 is situated substantiallyvertically above shaft 123 so that the spring 137 extends outwardly tothe plates 134 when these plates are in the position shown in FIG. 8.The spring therefore biasses the plate in this position which means thatshaft 123 has been rotated so that pedal 121 is in the uppermostposition and pedal 91 is in the lowermost position. Under theseconditions the machine is in the punch press mode and pedal 121 willactuate the main shuttle valve component 98 as hereinbefore described.

If, however, the slide component 133 is moved along the slot 131 to theopposite end, the spring 137 will bias this other end upwardly so thatthe slotted plate 130 takes the position shown in in phantom in FIG. 8.This rotates shaft 123 anti-clockwise and causes pedal 121 to lower andpedal 91 to raise. This reverses the main shuttle valve 93 so that themachine is now in the accessory or shear mode.

An actuator fork 138 comprises a horizontal plate 139 situated on the.bottom of a crank 140 which depends from shaft 128 (see FIG. 7). A pairof pins 141 extend outwardly from plate 139 and engage freely around theedges of the plates 134 of the slide component 133.

Movement of the lever 126 will therefore move the actuator fork fromleft to right thus moving the slide component 133 from one end of theslot 131 to the other and vice versa thus accomplishing the modeselection hereinbefore described.

It should be stressed that the normal operation of the accessory orshear mode or the punch press mode is accomplished by the piston andcylinder assembly 37 with piston and cylinder assembly 38 acting as thefast return for either mode. However, when additional power is requiredin either mode, piston and cylinder assembly 38 can be cut in toreinforce the action of piston and cylinder assembly 37 but under thesecircumstances it should be appreciated that piston and cylinder assembly38 still acts as the fast return for either mode.

Means are provided to control the upper and lower limits of the powerstrokes of the main beam whether it is in the accessory or shear mode orin the punch press mode.

A link 142 is pivotally secured by the upper end thereof by means ofpivot pin 143 to the main beam on the portion 36 but close to thetrunion 33. This link extends downwardly and is pivotally secured by theother end thereof by means of pivot pin 144 to one end of a lever 145pivoted intermediate the ends thereof upon pivot pin 146. This lever 145is externally of the machine as shown in FIG. 18.

An apertured sleeve 147 is mounted upon the other end of the lever 145and this apertured sleeve is pivotally secured to said other end so thatit can move up and down a control rod 148 situated vertically externallyof the machine and extending downwardly towards the pedal assembly 88.

The lower end of this control rod is pivotally secured by means of pivot149 to a lug 150 offstanding from shaft 89 (see FIG. The upper end ofthis control rod is screw threaded and knurled adjustors 151 and 152engage this screw threaded portion above and below the sleeve 147respectively.

Assuming for the purposes of explanation that the machine is in theaccessory or shear mode, the pedal 91 is depressed thus causing theportion '36 of the main beam to move downwardly. This moves link 142downwardly and pivots lever 145 upon pivot 146 thus raising sleeve 147upwardly along the screw threaded portion of the control rod 148. Whenit strikes the upper adjustor 151, the control rod 148 is lifted andthis rotates shaft 89 and raises pedal 91 thus moving the shuttle valveelement 98 to the neutral position thus causing the pump to unloaddirectly to reservoir 27 and stopping the action precisely. This meansthat the downward movement of the main beam is controlled by adjustingthe upper adjustor 151 upon the screw threaded portion of the controlrod 148. When the pedal 91 is released further by the operator spring 37its moves the spool of valve 98 to the reverse position thus returningthe main beam to the uppermost position ready for the next stroke. Whenin this position the control rod actuates the valve spool and moves thevalve back to the neutral position until the pedal is once againdepressed.

By the same token, when in the punch press mode, lever 145 moves in theopposite direction thus causing sleeve 147 to move downwardly and engagethe lower adjustor 152 which once again rotates shaft 89 in the oppositedirection due to the fact that the hydraulic systems have been reversedfor this mode. The adjustors 151 and 152 therefore give extremelyaccurate control of the movement of the accessories or shear componentor punch press, such control not being available by conventionaloverload valves. This adds to the precision operation of the machine inall phases of its operation and enables the operator to adjust, quickly,either the upper and/or the lower position and consequently the strokelength and position.

Referring back to the mandrel 78, it will be noted that a slide block isfitted between the upper end 80 of the mandrel and the rounded surface81 of the main beam to take care of the slight sideways movement occurring at this high stress point due to the fact that the end of thebeamis moving through an arc during operation. A similar slide block canbe used in reverse on accessory 67 as shown in phantom in FIG. 1.

Although the mandrel has been described as being engaged by the spindleit should be appreciated that normally the mandrel is raised and loweredas the beam reapproaches. However when setting up the punch pressoperation it is sometimes desirable to lower the mandrel independentlyfor positioning purposes and it is under these circumstances that theautomatic engagement takes place as described.

Note should be taken of the adjusting bolt and lock nut 153 extendsupwardly from the place 30-adjacent the web 44 between link plates 43connected to one end of the main beam. A block 154 is welded between thelink plates and when the bolt 153 is adjusted, the downward movement ofthis portion of the main beam is controlled in a positive fashion. Thisis used when air breaking is required or when it is desired to terminatethe downward movement of the break at the same position each time. It isnot possible to be this accurate relying only on the valve arrangementbut with positive stop, the physical position of the beam is exactly thesame on each stroke with the hydraulic system unloading the reliefvalve.

FIG. 20 shows an alternative embodiment of the mechanism 88, identified88A in this figure.

In this embodiment, a support member 155 is situated above one end ofshaft 89 and extends at right angles thereto and the lever 126 togetherwith the control knob 127 is journalled within a bearing 156 by means ofthe shaft 128, upon this support member 155.

This means that the lever 126' extends beyond the machine adjacent thepedal or treadle 121 rather than at the front which makes for moreconvenient operation.

Pedal 121 is connected to shaft 89 by means of member 122 ashereinbefore described except that the member is at right angles to thepedal and connects directly to shaft 89 rather than through bevel gears125.

The member 130 is connected to the leverl26 in a manner similar to thatin the previous embodiment and this member operates shaft 89 as shown inFIG. 8.

The advantages of this embodiment are twofold.

'First the bevel gears 125 are eliminated together with any backlashwhich might be generated therebetween and secondly the operating lever126 is adjacent the pedal 121 at one end of the machine rather than inthe front as in the previous embodiment. 1

Various modifications can be made within the scope of the inventiveconcept which is herein disclosed and/or claimed.

What I claim as my invention is:

1. An iron and metal working machine comprising in combination asupporting framework, a main beam pivoted between the ends thereof tosaid supporting framework thereby defining a relatively short punchpress side and a relative long accessory operating side, a pair ofhydraulic piston and cylinder assemblies mounted on trunions in saidframework below said relatively long side, said piston and cylinderassemblies being operatively connected to adjacent the end of saidrelatively long side, a source of hydraulic power operatively connectedto said piston and cylinder assemblies, and valve means on saidframework selectively engageable between said piston and cylinderassemblies and said source of hydraulic power whereby hydraulic fluidcan be routed to either side of the piston of one of said piston andcylinder assemblies and to either side of the piston of the other saidpiston and cylinder assemblies, either singlely or together, said sourceof power including a constant displacement pump, said one piston andcylinder assembly having a larger volumetric capacity than said otherpiston and cylinder assembly, thereby providing a faster movement tosaid main beam when operated singlely and providing additional power tosaid to main beam when operated together with said other piston andcylinder assembly.

2. The machine according to claim 1 which includes a pedal assembly onsaid framework operatively connected to said valve means, said assemblyhaving a punch press operating pedal and an accessory operat ing pedal,and means mounted on said framework operatively connected between saidvalve means and said pedal assembly whereby either said punch pressoperating pedal is in the operative position or said accessory operatingpedal is in the operative position.

3. The machine according to claim 2 in which said valve means includes amain shuttle valve operatively connected to said pedal assembly and aplurality of manually operated selector valves operatively connectedbetween said shuttle valve and said hydraulic piston and cylinderassemblies.

4. The machine according to claim 2 in which said means mounted on saidframework operatively connected between said valve means and said pedalassembly includes a shaft mounting said pedal assembly, a lever movablebetween a first accessory mode position and a second punch press modeposition, and an over center rocker assembly between said lever and saidshaft.

5 The machine according to claim 4 in which said rocker assemblyincludes a slotted plate secured to said shaft, an over center slidecomponent mounted in the slot in said plate for endwise movement fromone end to the other of said slot, slider component being spring loadedupwardly, and an actuator fork on said lever and engaging said slidercomponent for moving same along said slot in said plate.

6. The machine according to claim 3 in which said means mounted on saidframework operatively connected between said valve means and said pedalassembly includes a shaft mounting said pedal assembly, a lever movablebetween a first accessory mode position and a second punch press modeposition, and an over center rocker assembly between said lever and saidshaft.

7. The machine according to claim 6 in which said rocker assemblyincludes a slotted plate secured to said shaft, an over center slidecomponent mounted in the slot in said plate for endwise movement fromone end to the other of said slot, slider component being spring loadedupwardly, and an actuator fork on said lever and engaging said slidercomponent for moving said slider along said slot in said plate.

8. An iron and metal working machine comprising in combination asupporting framework, a main beam pivoted between the ends thereof tosaid supporting framework thereby defining a relatively short punchpress side and a relative long accessory operating side, a pair ofhydraulic piston and cylinder assemblies mounted on trunions in saidframework below said relatively long side, said piston and cylinderassemblies being operatively connected to adjacent the end of saidrelatively long side, a source of hydraulic power operatively connectedto said piston and cylinder assemblies, valve means on said frameworkselectively engageable between said piston and cylinder assemblies andsaid source of hydraulic power whereby hydraulic fluid can be routed toeither side of the piston of one of said piston and cylinder assembliesand to either side of the piston of the other said piston and cylinderassemblies, either singlely or together, and a secondary beam pivoted byone end thereof within said framework below said main beam, saidsecondary beam including a shear assembly connected thereto, saidsecondary beam being connected adjacent the other end thereof to saidpiston and cylinder assemblies.

9. The machine according to claim 8 which includes a pedal assembly onsaid framework operatively connected to said valve means, said assemblyhaving a punch press operating pedal and an accessory operating pedal,and means mounted on said framework operatively connected between saidvalve means and said pedal assembly whereby either said punch pressoperating pedal is in the operative position or said accessory operatingpedal is in the operative position.

10. The machine according to claim 9 in which said valve means includesa main shuttle valve operatively connected to said pedal assembly and aplurality of manually operated selector valves operatively connectedbetween said shuttle valve and said hydraulic piston and cylinderassemblies.

11. The machine according to claim 9 in which said means mounted on saidframework operatively connected between said valve means and said pedalassembly includes a shaft mounting said pedal assembly, a lever movablebetween a first accessory mode position and a second punch press modeposition, and an over center rocker assembly between said lever and saidshaft.

12. The machine according to claim 11 in which said rocker assemblyincludes a slotted plate secured to said shaft, an over center slidecomponent mounted in the slot in said plate for endwise movement fromone end to the other of said slot, slider component being spring loadedupwardly, and an actuator fork on said lever and engaging said slidercomponent for moving same along said slot in said plate.

13. The machine according to claim 3 in which said means mounted on saidframework operatively connected between said valve means and said pedalassembly includes a shaft mounting said pedal assembly, a lever movablebetween a first accessory mode position and a second punch press modeposition, and an over center rocker assembly between said lever and saidshaft.

14. The machine according to claim 13 in which said rocker assemblyincludes a slotted plate secured to said shaft, an over center slidecomponent mounted inthe slot in said plate for endwise movement from oneend to the other of said slot, slider component being spring loadedupwardly, and an actuator fork on said lever and engaging said slidercomponent for moving same along said slot in said plate.

15. The machine according to claim in which said means mounted on saidframework operatively connected between said valve means and said pedalassembly includes a shaft mounting said pedal assembly, a lever movablebetween a first accessory mode position and a second punch press modepositiori, and an over center rocker assembly between said lever andsaid shaft.

16. The machine according to claim 15 in which said rocker assemblyincludes a slotted plate secured to said shaft, an over center slidecomponent mounted on the slot in said plate for endwise movement fromone end to the other of said slot, slider component being spring loadedupwardly, and an actuator fork on said lever and engaging said slidercomponent for moving said slider along said slot in said plate.

17. The machine according to claim 3 in which said means mounted on saidframework operatively connected between said valve means and said pedalassembly includes a shaft mounting said pedal assembly, a lever movablebetween a first accessory mode position and a second punch press modeposition, and an over center rocker assembly between said lever and saidshaft.

18. The machine according to claim 17 in which said rocker assemblyincludes a slotted plate secured to said shaft, an over center slidecomponent mounted in the slot in said plate for endwise movement fromone end to the other of said slot, slider component being spring loadedupwardly, and an actuator fork on said lever and engaging said slidercomponent for moving same along said slot in said plate.

19. The machine according to claim 8 in which said other piston andcylinder assembly is connected to the other end of said secondary beaminboard of said one piston and cylinder assembly.

20. The machine according to claim 19 in which said source of powerincluding a constant displacement pump, said one piston and cylinderassembly having a larger volumetric capacity than said other piston andcylinder assembly.

21. The machine according to claim 19 which includes a pedal assembly onsaid framework operatively connected to said valve means, said assemblyhaving a punch press operating pedal and an accessory operating pedal,and means mounted on said framework operatively connected between saidvalve means and said pedal assembly whereby either said punch pressoperating pedal is in the operative position or said accessory operatingpedal is in the operative position.

22. The machine according to claim 21' in which said valve meansincludes a main shuttle valve operatively connected to said pedalassembly and a plurality of manually operated selector valvesoperatively connected between said shuttle valve and said hydraulicpiston and cylinder assemblies.

23. The machine according to claim 22 in which said means mounted onsaid framework operatively connected between said valve means and saidpedal assembly includes a shaft mounting said pedal assembly, a levermovable between a first accessory mode position and a second punch pressmode position, and an over center rocker assembly between said lever andsaid shaft.

24. The machine according to claim 23 in which said rocker assemblyincludes a slotted plate secured to said shaft, an over center slidecomponent mounted in the slot in said plate for endwise movement fromone end to the other of said slot, slider component being spring loadedupwardly, and an actuator fork on said lever and engaging said slidercomponent for moving same along said slot in said plate.

25. An iron and metal working machine comprising in combination asupporting framework, a main beam pivoted between the ends thereof tosaid supporting framework thereby defining a relatively short punchpress side and a relative long accessory operating side, a pair ofhydraulic piston and cylinder assemblies mounted on trunions in saidframework below said relatively long side, said piston and cylinderassemblies being operatively connected to adjacent the end of saidrelatively long side, a source of hydraulic power operatively connectedto said piston and cylinder assemblies, valve means on said frameworkselectively engageable between said piston and cylinder assemblies andsaid source of hydraulic power whereby hydraulic fluid can be routed toeither side of the piston of one of said piston and cylinder assembliesand to either side of the piston of the other said piston and cylinderassemblies, either singlely or together, and a pedal assembly on saidframework operatively connected to said valve means, said assemblyhaving a punch press operating pedal and an accessory operating pedal,and means mounted on said framework operatively connected between saidvalve means and said pedal assembly whereby either said punch pressoperating pedal is in the operative position or said accessory operatingpedal is in the operative position.

26. The machine according to claim 25 in which said valve means includesa main shuttle valve operatively connected to said pedal assembly and aplurality of manually operated selector valves operatively connectedbetween said shuttle valve and said hydraulic piston and cylinderassemblies.

27. The machine according to claim 25 in which said means mounted onsaid framework operatively connected between said valve means and saidpedal assembly includes a shaft mounting said pedal assembly,

a lever movable between a first accessory mode position and a secondpunch press mode position, and an over center rocker assembly betweensaid lever and said shaft.

28. The machine according to claim 27 in which said rocker assemblyincludes a slotted plate secured to said shaft, an over center slidecomponent mounted in the slot in said plate for endwise movement fromone end to the other of said slot, slider component being spring loadedupwardly, and an actuator fork on said lever and engaging said slidercomponent for moving same along said slot in said plate.

1. An iron and metal working machine comprising in combination asupporting framework, a main beam pivoted between the ends thereof tosaid supporting framework thereby defining a relatively short punchpress side and a relative long accessory operating side, a pair ofhydraulic piston and cylinder assemblies mounted on trunions in saidframework below said relatively long side, said piston and cylinderassemblies being operatively connected to adjacent the end of saidrelatively long side, a source of hydraulic power operatively connectedto said piston and cylinder assemblies, and valve means on saidframework selectively engageable between said piston and cylinderassemblies and said source of hydraulic power whereby hydraulic fluidcan be routed to either side of the piston of one of said piston andcylinder assemblies and to either side of the piston of the other saidpiston and cylinder assemblies, either singlely or together, said sourceof power including a constant displacement pump, said one piston andcylinder assembly having a larger volumetric capacity than said otherpiston and cylinder assembly, thereby providing a faster movement tosaid main beam when operated singlely and providing additional power tosaid to main beam when operated together with said other piston andcylinder assembly.
 2. The machine according to claim 1 which includes apedal assembly on said framework operatively connected to said valvemeans, said assembly having a punch press operating pedal and anaccessory operating pedal, and means mounted on said frameworkoperatively connected between said valve means and said pedal assemblywhereby either said punch press operating pedal is in the operativeposition or said accessory operating pedal is in the operative position.3. The machine according to claim 2 in which said valve means includes amain shuttle valve operatively connected to said pedal assembly and aplurality of manually operated selector valves operatively connectedbetween said shuttle valve and said hydraulic piston and cylinderassemblies.
 4. The machine according to claim 2 in which said meansmounted on said framework operatively connected between said valve meansand said pedal assembly includes a shaft mounting said pedal assembly, alever movable between a first accessory mode position and a second punchpress mode position, and an over center rocker assembly between saidlever and said shaft.
 5. The machine according to claim 4 in which saidrocker assembly includes a slotted plate secured to said shaft, an overcenter slide component mounted in the slot in said plate for endwisemovement from one end to the other of said slot, slider component beingspring loaded upwardly, and an actuator fork on said lever and engagingsaid slider component for moving same along said slot in said plate. 6.The machine according to claim 3 in which said means mounted on saidframework operatively connected between said valve means and said pedalassembly includes a shaft mounting said pedal assembly, a lever movablebetween a first accessory mode position and a second punch press modeposition, and an over center rocker assembly between said lever and saidshaft.
 7. The machine according to claim 6 in which said rocker assemblyincludes a slotted plate secured to said shaft, an over center slidecomponent mounted in the slot in said plate for endwise movement fromone end to the other of said slot, slider component being spring loadedupwardly, and an actuator fork on said lever and engaging said slidercomponent for moving said slider along said slot in said plate.
 8. Aniron and metal working machine comprising in combination a supportingframework, a main beam pivoted between the ends thereof to saidsupporting framework thereby defining a relatively short punch pressside and a relative long accessory operating side, a pair of hydraulicpiston and cylinder assemblies mounted on trunions in said frameworkbelow said relatively long side, said piston and cylinder assembliesbeing operatively connected to adjacent the end of said relatively longside, a source of hydraulic power operatively connected to said pistonand cylinder assemblies, valve means on said framework selectivelyengageable between said piston and cylinder assemblies and said sourceof hydraulic power whereby hydraulic fluid can be routed to either sideof the piston of one of said piston and cylinder assemblies and toeither side of the piston of the other said piston and cylinderassemblies, either singlely or together, and a secondary beam pivoted byone end thereof within said framework below said main beam, saidsecondary beam including a shear assembly connected thereto, saidsecondary beam being connected adjacent the other end thereof to saidpiston and cylinder assemblies.
 9. The machine according to claim 8which includes a pedal assembly on said framework operatively connectedto said valve means, said assembly having a punch press operating pedaland an accessory operating pedal, and means mounted on said frameworkoperatively connected between said valve means and said pedal assemblywhereby either said punch press operating pedal is in the operativeposition or said accessory operating pedal is in the operative position.10. The machine according to claim 9 in which said valve mEans includesa main shuttle valve operatively connected to said pedal assembly and aplurality of manually operated selector valves operatively connectedbetween said shuttle valve and said hydraulic piston and cylinderassemblies.
 11. The machine according to claim 9 in which said meansmounted on said framework operatively connected between said valve meansand said pedal assembly includes a shaft mounting said pedal assembly, alever movable between a first accessory mode position and a second punchpress mode position, and an over center rocker assembly between saidlever and said shaft.
 12. The machine according to claim 11 in whichsaid rocker assembly includes a slotted plate secured to said shaft, anover center slide component mounted in the slot in said plate forendwise movement from one end to the other of said slot, slidercomponent being spring loaded upwardly, and an actuator fork on saidlever and engaging said slider component for moving same along said slotin said plate.
 13. The machine according to claim 3 in which said meansmounted on said framework operatively connected between said valve meansand said pedal assembly includes a shaft mounting said pedal assembly, alever movable between a first accessory mode position and a second punchpress mode position, and an over center rocker assembly between saidlever and said shaft.
 14. The machine according to claim 13 in whichsaid rocker assembly includes a slotted plate secured to said shaft, anover center slide component mounted in the slot in said plate forendwise movement from one end to the other of said slot, slidercomponent being spring loaded upwardly, and an actuator fork on saidlever and engaging said slider component for moving same along said slotin said plate.
 15. The machine according to claim 10 in which said meansmounted on said framework operatively connected between said valve meansand said pedal assembly includes a shaft mounting said pedal assembly, alever movable between a first accessory mode position and a second punchpress mode position, and an over center rocker assembly between saidlever and said shaft.
 16. The machine according to claim 15 in whichsaid rocker assembly includes a slotted plate secured to said shaft, anover center slide component mounted on the slot in said plate forendwise movement from one end to the other of said slot, slidercomponent being spring loaded upwardly, and an actuator fork on saidlever and engaging said slider component for moving said slider alongsaid slot in said plate.
 17. The machine according to claim 3 in whichsaid means mounted on said framework operatively connected between saidvalve means and said pedal assembly includes a shaft mounting said pedalassembly, a lever movable between a first accessory mode position and asecond punch press mode position, and an over center rocker assemblybetween said lever and said shaft.
 18. The machine according to claim 17in which said rocker assembly includes a slotted plate secured to saidshaft, an over center slide component mounted in the slot in said platefor endwise movement from one end to the other of said slot, slidercomponent being spring loaded upwardly, and an actuator fork on saidlever and engaging said slider component for moving same along said slotin said plate.
 19. The machine according to claim 8 in which said otherpiston and cylinder assembly is connected to the other end of saidsecondary beam inboard of said one piston and cylinder assembly.
 20. Themachine according to claim 19 in which said source of power including aconstant displacement pump, said one piston and cylinder assembly havinga larger volumetric capacity than said other piston and cylinderassembly.
 21. The machine according to claim 19 which includes a pedalassembly on said framework operatively connected to said valve means,said assembly having a punch press operating pedal and an accessoryoperating pedal, and means mounted on said framework operativelycoNnected between said valve means and said pedal assembly wherebyeither said punch press operating pedal is in the operative position orsaid accessory operating pedal is in the operative position.
 22. Themachine according to claim 21 in which said valve means includes a mainshuttle valve operatively connected to said pedal assembly and aplurality of manually operated selector valves operatively connectedbetween said shuttle valve and said hydraulic piston and cylinderassemblies.
 23. The machine according to claim 22 in which said meansmounted on said framework operatively connected between said valve meansand said pedal assembly includes a shaft mounting said pedal assembly, alever movable between a first accessory mode position and a second punchpress mode position, and an over center rocker assembly between saidlever and said shaft.
 24. The machine according to claim 23 in whichsaid rocker assembly includes a slotted plate secured to said shaft, anover center slide component mounted in the slot in said plate forendwise movement from one end to the other of said slot, slidercomponent being spring loaded upwardly, and an actuator fork on saidlever and engaging said slider component for moving same along said slotin said plate.
 25. An iron and metal working machine comprising incombination a supporting framework, a main beam pivoted between the endsthereof to said supporting framework thereby defining a relatively shortpunch press side and a relative long accessory operating side, a pair ofhydraulic piston and cylinder assemblies mounted on trunions in saidframework below said relatively long side, said piston and cylinderassemblies being operatively connected to adjacent the end of saidrelatively long side, a source of hydraulic power operatively connectedto said piston and cylinder assemblies, valve means on said frameworkselectively engageable between said piston and cylinder assemblies andsaid source of hydraulic power whereby hydraulic fluid can be routed toeither side of the piston of one of said piston and cylinder assembliesand to either side of the piston of the other said piston and cylinderassemblies, either singlely or together, and a pedal assembly on saidframework operatively connected to said valve means, said assemblyhaving a punch press operating pedal and an accessory operating pedal,and means mounted on said framework operatively connected between saidvalve means and said pedal assembly whereby either said punch pressoperating pedal is in the operative position or said accessory operatingpedal is in the operative position.
 26. The machine according to claim25 in which said valve means includes a main shuttle valve operativelyconnected to said pedal assembly and a plurality of manually operatedselector valves operatively connected between said shuttle valve andsaid hydraulic piston and cylinder assemblies.
 27. The machine accordingto claim 25 in which said means mounted on said framework operativelyconnected between said valve means and said pedal assembly includes ashaft mounting said pedal assembly, a lever movable between a firstaccessory mode position and a second punch press mode position, and anover center rocker assembly between said lever and said shaft.
 28. Themachine according to claim 27 in which said rocker assembly includes aslotted plate secured to said shaft, an over center slide componentmounted in the slot in said plate for endwise movement from one end tothe other of said slot, slider component being spring loaded upwardly,and an actuator fork on said lever and engaging said slider componentfor moving same along said slot in said plate.